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Methods for Obtaining IPv6 Prefixes for DHCPv6 Prefix Delegation
You can set up the BNG to select IPv6 prefixes to be delegated to the requesting router in one the following ways:
- An external source such as a AAA RADIUS server or a DHCP server using the DHCPv6 relay agent.
- Dynamic assignment from a local pool of prefixes that
is configured on the BNG
You can specify the name of a delegated pool to use for prefix delegation, which means that you do not need to use AAA to obtain the pool name. In this configuration, if you have also specified a pool match order, the specified delegated pool takes precedence.
Using a AAA RADIUS Server to Obtain IPv6 Prefixes for Prefix Delegation
When the BNG needs to obtain a prefix for DHCPv6 prefix delegation, it uses the values in one of the following RADIUS attributes:
- Delegated-IPv6-Prefix—The attribute contains an IPv6 prefix that the BNG can send to the CPE.
- Jnpr-IPv6-Delegated-Pool-Name—The attribute contains the name of an address-assignment pool configured on the BNG from which the BNG can select a prefix to send to the CPE.
Both attributes are sent from the RADIUS server to the BNG in RADIUS Access-Accept messages.
